public class test2 {
    public static void main(String[] args){
        int[] arr = { 1, 2, 3};
        String result = splicing(arr);
        System.out.println(result);
    }
    public  static String splicing(int[] arr){
        StringBuilder sb = new StringBuilder("[");
        for(int i = 0;i < arr.length;i++){
            if(i == arr.length - 1)
                sb.append(arr[i]);
            else
                sb.append(arr[i]).append(",");
        }
        sb.append("]");
        return sb.toString();
    }
}
